summaryrefslogtreecommitdiff
path: root/Master/tlpkg/installer/install-tl-gui.tcl
blob: d9b1abdf80a65075d7a6a6ed2af9e337159965d1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
#!/usr/bin/env wish

# Copyright 2018 Siep Kroonenberg

# This file is licensed under the GNU General Public License version 2
# or any later version.

# Tcl/Tk frontend for TeX Live installer

# Installation can be divided into three stages:
#
# 1. preliminaries. This stage may involve some interaction with the user,
#    which can be channeled through message boxes
# 2. a menu
# 3. the actual installation
#
# During stage 1. and 3. this wrapper collects stdout and stderr from
# the perl installer, with stderr being redirected to stdout.
# This output will be displayed in a text widget during stage 3,
# and in debug mode also in stage 1.
# During stage 3, we shall use event-driven, non-blocking I/O, which is
# needed for a scrolling display of installer output.
#
# Main window:
# filled successively with:
# - a logo, and 'loading...' label, by way of splash
# - a menu for stage 2
# - a log text widget for tracking stage 3
#   ::out_log should be cleared before stage 3.
#
# In profile mode, the menu stage is skipped.

package require Tk

# security: disable send
catch {rename send {}}

# This file should be in $::instroot/tlpkg/installer.
# On non-windows platforms, install-tl functions as a wrapper
# for this file if it encounters a parameter '-gui tcl'.
# This allows automatic inclusion of a '--' parameter to separate
# tcl parameters from script parameters.
# At the next release, it may be better to have a shell script wrapper
# in the root, although [ba]sh has its challenges when it comes
# to handling the parameter array.

set ::instroot [file normalize [info script]]
set ::instroot [file dirname [file dirname [file dirname $::instroot]]]

# declarations and procs shared with tlshell.tcl
source [file join $::instroot "tlpkg" "tltcl" "tltcl.tcl"]

### initialize some globals ###

# perl installer process id
set ::perlpid 0

set ::out_log {}; # list of strings

set ::perlbin "perl"
if {$::tcl_platform(platform) eq "windows"} {
  set ::perlbin "${::instroot}/tlpkg/tlperl/bin/wperl.exe"
}

### procedures, mostly organized bottom-up ###

# the procedures which provide the menu with the necessary backend data,
# i.e. read_descs, read_vars and read_menu_data, are defined near the end.

set clock0 [clock milliseconds]
set profiling 0
proc show_time {s} {
  if $::profiling {
    puts [format "%s: %d" $s [expr {[clock milliseconds] - $::clock0}]]
  }
}

# for debugging frontend-backend communication:
# write to a logfile which is shared with the backend.
# both parties open, append and close every time.

#if {$::tcl_platform(os) eq "Darwin"} {
#  set ::dblfile "$::env(TMPDIR)/dblog"
#} elseif {$::tcl_platform(platform) eq "unix"} {
#  set ::dblfile "/tmp/dblog"
#} else {
#  set ::dblfile "$::env(TEMP)/dblog.txt"
#}
#proc dblog {s} {
#  set db [open $::dblfile a]
#  set t [get_stacktrace]
#  puts $db "TCL: $s\n$t"
#  close $db
#}

proc maybe_print_welcome {} {
  # if the last non-empty line was "All done", then installation is completed.
  # otherwise, it was help output or an interrupted installation.
  # we allow for spurious empty lines at the end of the backend output.

  set all_done 0
  for {set i [.log.tx count -lines 1.0 end]} {$i > 0} {incr i -1} {
    set l  [.log.tx get ${i}.0 ${i}.end]
    if {$l ne ""} {
      puts $l
      if {[string range $l 0 11] eq "Installed on"} {
        set all_done 1
      }
      break
    }
  }
  if {!$all_done} return
  # need TEXDIR and this_platform in case of profile install
  if {! [info exists ::vars(this_platform)] || \
          ! [info exists ::vars(TEXDIR)]} {
    if [regexp {^Installed on platform (.*) at (.*)$} $l m p r] {
      set ::vars(this_platform) $p
      set ::vars(TEXDIR) $r
    } else {
      set ::vars(this_platform) "PLATFORM"
      set ::vars(TEXDIR) "ROOT"
    }
  }

  .log.tx configure -state normal
  .log.tx tag configure center -justify center
  .log.tx delete ${i}.0 end
  .log.tx insert end "\n\n"
  .log.tx insert end [__ "Welcome to TeX Live!"] center
  .log.tx insert end "\n\n"
  # tags appear to interfere with --/::msgcat::mc !?!
  set s  [__ "See %s/index.html for links to documentation.\nThe TeX Live web site (http://tug.org/texlive/) contains any updates and corrections. TeX Live is a joint project of the TeX user groups around the world; please consider supporting it by joining the group best for you. The list of groups is available on the web at http://tug.org/usergroups.html." $::vars(TEXDIR)]
  .log.tx insert end $s center
  if {$::tcl_platform(platform) ne "windows"} {
    .log.tx insert end "\n\n"
    set s [__ "Add %s/texmf-dist/doc/man to MANPATH.\nAdd %s/texmf-dist/doc/info to INFOPATH.\nMost importantly, add %s/bin/%s\nto your PATH for current and future sessions."  $::vars(TEXDIR) $::vars(TEXDIR) $::vars(TEXDIR) $::vars(this_platform)]
    .log.tx insert end $s center
  }
  .log.tx insert end "\n"
  .log.tx yview moveto 1
  if {$::tcl_platform(os) ne "Darwin"} {.log.tx configure -state disabled}
}

# regular read_line
proc read_line {} {
  if [catch {chan gets $::inst l} len] {
    # catch [chan close $::inst]
    err_exit [__ "Error while reading from Perl backend"]
  } elseif {$len < 0} {
    # catch [chan close $::inst]
    return [list -1 ""]
  } else {
    return [list $len $l]
  }
}; # read_line

proc read_line_no_eof {} {
  set ll [read_line]
  if {[lindex $ll 0] < 0} {
    log_exit [__ "Unexpected closed backend"]
  }
  set l [lindex $ll 1]
  # TODO: test under debug mode
  return $l
}; # read_line_no_eof

# non-blocking i/o: callback for "readable" during stage 3, installation
# ::out_log should no longer be needed
proc read_line_cb {} {
  set l "" ; # will contain the line to be read
  if {([catch {chan gets $::inst l} len] || [chan eof $::inst])} {
    catch {chan close $::inst}
    # note. the right way to terminate is terminating the GUI shell.
    # This closes stdin of the child
    .close state !disabled
    if [winfo exists .abort] {.abort state disabled}
    maybe_print_welcome
  } elseif {$len >= 0} {
    # regular output
    .log.tx configure -state normal
    .log.tx insert end "$l\n"
    .log.tx yview moveto 1
    if {$::tcl_platform(os) ne "Darwin"} {.log.tx configure -state disabled}
  }
}; # read_line_cb

##############################################################

##### special-purpose uses of main window: splash, log #####

proc make_splash {} {

  # wm overrideredirect . true

  # picture and logo
  catch {
    image create photo tlimage -file \
        [file join $::instroot "tlpkg" "installer" "texlion.gif"]
    pack [frame .white -background white] -fill x -expand 1
    label .image -image tlimage -background white
    pack .image -in .white
  }

  # wallpaper
  pack [ttk::frame .bg -padding 3] -fill both -expand 1

  ppack [ttk::label .text -text [__ "TeX Live Installer"] \
             -font bigfont] -in .bg
  ppack [ttk::label .loading -text [__ "Loading..."]] -in .bg

  wm attributes . -topmost
  update
  wm state . normal
  raise .
}; # make_splash

# ATM ::out_log will be shown only at the end
proc show_log {{do_abort 0}} {
  wm withdraw .
  foreach c [winfo children .] {
    destroy $c
  }

  # wallpaper
  pack [ttk::frame .bg -padding 3] -fill both -expand 1

  # buttons at bottom
  pack [ttk::frame .bottom] -in .bg -side bottom -fill x
  ttk::button .close -text [__ "Close"] -command exit
  ppack .close -in .bottom -side right
  if $do_abort {
    ttk::button .abort -text [__ "Cancel"]  -command {
      set ans [tk_messageBox -message [__ "Really abort?"] -type yesno \
                   -default no]
      if {$ans eq "no"} return
      catch {chan close $::inst}
      exit
    }
    ppack .abort -in .bottom -side right
  }
  bind . <Escape> {
    if {[winfo exists .close] && ! [.close instate disabled]} {.close invoke}
  }

  # logs plus their scrollbars
  pack [ttk::frame .log] -in .bg -fill both -expand 1
  pack [ttk::scrollbar .log.scroll -command ".log.tx yview"] \
      -side right -fill y
  ppack [text .log.tx -height 10 -wrap word -font TkDefaultFont \
      -yscrollcommand ".log.scroll set"] \
      -expand 1 -fill both
  .log.tx configure -state normal
  .log.tx delete 1.0 end
  foreach l $::out_log {
    .log.tx insert end "$l\n"
  }
  if {$::tcl_platform(os) ne "Darwin"} {.log.tx configure -state disabled}
  .log.tx yview moveto 1

  wm resizable . 1 1
  wm overrideredirect . 0
  wm attributes . -topmost
  update
  wm state . normal
  raise .
}; # show_log

proc log_exit {{mess ""}} {
  if {$mess ne ""} {lappend ::out_log $mess}
  catch {chan close $::inst} ; # should terminate perl
  if {[llength $::out_log] > 0} {
    if {[llength $::out_log] < 10} {
      tk_messageBox -icon info -message [join $::out_log "\n"]
      exit
    } else {
      show_log ; # its close button exits
    }
  } else {
    exit
  }
}; # log_exit

#############################################################

##########################################################

##### installation root #####

proc update_full_path {} {
  set val [file join \
               [.tltd.prefix_l cget -text] \
               [.tltd.name_l cget -text] \
               [.tltd.rel_l cget -text]]
  set val [native_slashify $val]
  .tltd.path_l configure -text $val
  # ask perl to check path
  chan puts $::inst "checkdir"
  chan puts $::inst [forward_slashify [.tltd.path_l cget -text]]
  chan flush $::inst
  if {[read_line_no_eof] eq "0"} {
    .tltd.path_l configure -text \
        [__ "Cannot be created or cannot be written to"] \
        -foreground red
    .tltd.ok_b state disabled
  } else {
    .tltd.path_l configure -text $val -foreground $::blk
    .tltd.ok_b state !disabled
  }
  return
} ; # update_full_path

proc edit_name {} {
  create_dlg .tled .tltd
  wm title .tled [__ "Directory name..."]
  if $::plain_unix {wm attributes .tled -type dialog}

  # wallpaper
  pack [ttk::frame .tled.bg -padding 3] -fill both -expand 1

  # widgets
  ttk::label .tled.l -text [__ "Change name (slashes not allowed)"]
  pack .tled.l -in .tled.bg -padx 5 -pady 5
  ttk::entry .tled.e -width 20 -state normal
  pack .tled.e -in .tled.bg -pady 5
  .tled.e insert 0 [.tltd.name_l cget -text]

  # now frame with ok and cancel buttons
  pack [ttk::frame .tled.buttons] -in .tled.bg -fill x
  ttk::button .tled.ok_b -text [__ "Ok"] -command {
    if [regexp {[\\/]} [.tled.e get]] {
      tk_messageBox -type ok -icon error -message [__ "No slashes allowed"]
    } else {
      .tltd.name_l configure -text [.tled.e get]
      update_full_path
      end_dlg "" .tled
    }
  }
  ppack .tled.ok_b -in .tled.buttons -side right -padx 5 -pady 5
  ttk::button .tled.q_b -text [__ "Cancel"] -command {end_dlg "" .tled}
  ppack .tled.q_b -in .tled.buttons -side right -padx 5 -pady 5
  bind .tled <Escape> {.tled.q_b invoke}

  wm protocol .tled WM_DELETE_WINDOW {.tled.q_b invoke}
  wm resizable .tled 0 0
  place_dlg .tled .tltd
} ; # edit_name

proc toggle_rel {} {
  if {[.tltd.rel_l cget -text] ne ""} {
    set ans \
        [tk_messageBox -message \
             [__ "TL release component highly recommended!\nAre you sure?"] \
             -title [__ "Warning"] \
        -type yesno \
        -default no]
    if {$ans eq no} {
      return
    }
    .tltd.rel_l configure -text ""
    .tltd.sep1_l configure -text " "
    .tltd.rel_b configure -text [__ "Add year"]
  } else {
    .tltd.rel_l configure -text $::release_year
    .tltd.sep1_l configure -text [file separator]
    .tltd.rel_b configure -text [__ "Remove year"]
  }
  update_full_path
} ; # toggle_rel

proc commit_canonical_local {} {
  if {[file tail $::vars(TEXDIR)] eq $::release_year} {
    set l [file dirname $::vars(TEXDIR)]
  } else {
    set l $::vars(TEXDIR)
  }
  if {[forward_slashify $l] ne \
          [forward_slashify [file dirname $::vars(TEXMFLOCAL)]]} {
    set ::vars(TEXMFLOCAL) [forward_slashify [file join $l "texmf-local"]]
  }
}

proc commit_root {} {
  set ::vars(TEXDIR) [forward_slashify [.tltd.path_l cget -text]]
  set ::vars(TEXMFSYSVAR) "$::vars(TEXDIR)/texmf-var"
  set ::vars(TEXMFSYSCONFIG) "$::vars(TEXDIR)/texmf-var"
  commit_canonical_local

  if {$::vars(instopt_portable)} reset_personal_dirs
  destroy .tltd
}

### main directory dialog ###

proc texdir_setup {} {

  ### widgets ###

  create_dlg .tltd .
  wm title .tltd [__ "Installation root"]

  # wallpaper
  pack [ttk::frame .tltd.bg -padding 3] -expand 1 -fill both

  # full path
  pack [ttk::label .tltd.path_l -font lfont -anchor center] \
      -in .tltd.bg -pady 10 -fill x -expand 1

  # installation root components, gridded
  pack [ttk::frame .tltd.fr1 -borderwidth 2 -relief groove] \
      -in .tltd.bg -fill x -expand 1
  grid columnconfigure .tltd.fr1 0 -weight 1
  grid columnconfigure .tltd.fr1 2 -weight 1
  grid columnconfigure .tltd.fr1 4 -weight 1
  set rw -1
  # path components, as labels
  incr rw
  pgrid [ttk::label .tltd.prefix_l] -in .tltd.fr1 -row $rw -column 0
  pgrid [ttk::label .tltd.sep0_l -text [file separator]] \
      -in .tltd.fr1 -row $rw -column 1
  pgrid [ttk::label .tltd.name_l] -in .tltd.fr1 -row $rw -column 2
  pgrid [ttk::label .tltd.sep1_l -text [file separator]] \
      -in .tltd.fr1 -row $rw -column 3
  pgrid [ttk::label .tltd.rel_l -width 6] \
      -in .tltd.fr1 -row $rw -column 4
  # corresponding buttons
  incr rw
  pgrid [ttk::button .tltd.prefix_b -text [__ "Browse..."] \
          -command {if [dirbrowser2widget .tltd.prefix_l] update_full_path}] \
      -in .tltd.fr1 -row $rw -column 0
  pgrid [ttk::button .tltd.name_b -text [__ "Change"] -command edit_name] \
      -in .tltd.fr1 -row $rw -column 2
  pgrid [ttk::button .tltd.rel_b -text [__ "Remove year"] \
      -command toggle_rel] \
      -in .tltd.fr1 -row $rw -column 4

  # windows: note about localized names
  if {$::tcl_platform(platform) eq "windows"} {
    ttk::label .tltd.loc -anchor w
    .tltd.loc configure -text \
        [__ "Localized directory names will be replaced by their real names"]
    ppack .tltd.loc -in .tltd.bg -fill x
  }

  # ok/cancel buttons
  pack [ttk::frame .tltd.frbt] -in .tltd.bg -pady [list 10 0] -fill x
  ttk::button .tltd.ok_b -text [__ "Ok"] -command commit_root
  ppack .tltd.ok_b -in .tltd.frbt -side right
  ttk::button .tltd.cancel_b -text [__ "Cancel"] \
             -command {destroy .tltd}
  ppack .tltd.cancel_b -in .tltd.frbt -side right
  bind .tltd <Escape> {.tltd.cancel_b invoke}

  ### initialization and callbacks ###

  set val [native_slashify [file normalize $::vars(TEXDIR)]]
  regsub {[\\/]$} $val {} val

  set initdir $val
  set name ""
  set rel ""

  # TL release subdirectory at the end?
  set rel_pat {[\\/](}
  append rel_pat  $::release_year {)$}
  if [regexp $rel_pat $initdir m rel] {
    set rel $::release_year
    regsub $rel_pat $initdir {} initdir
  }
  .tltd.rel_l configure -text $rel

  # next-last component
  regexp {^(.*)[\\/]([^\\/]*)$} $initdir m initdir name
  .tltd.name_l configure -text $name

  # backtrack remaining initdir to something that exists
  # and assign it to prefix
  set initprev ""
  while {! [file isdirectory $initdir]} {
    set initprev $initdir
    regexp {^(.*)[\\/]([^\\/]*)} $initdir m initdir m1
    if {$initprev eq $initdir} break
  }

  if {$initdir eq "" || \
          ($::tcl_platform(platform) eq "windows" && \
               [string index $initdir end] eq ":")} {
    append initdir [file separator]
  }
  .tltd.prefix_l configure -text $initdir
  update_full_path

  bind .tltd <Return> commit_root
  bind .tltd <Escape> {destroy .tltd}

  wm protocol .tltd  WM_DELETE_WINDOW {.tltd.cancel_b invoke}
  wm resizable .tltd 1 0
  place_dlg .tltd
} ; # texdir_setup

##### other directories: TEXMFLOCAL, TEXMFHOME, portable #####

proc edit_dir {d} {
  create_dlg .td .
  wm title .td $d
  if $::plain_unix {wm attributes .td -type dialog}

  # wallpaper
  pack [ttk::frame .td.bg -padding 3] -fill both -expand 1

  if {$d eq "TEXMFHOME"} {
    # explain tilde
    if {$::tcl_platform(platform) eq "windows"} {
      set ev "%USERPROFILE%"
      set xpl $::env(USERPROFILE)
    } else {
      set ev "\$HOME"
      set xpl $::env(HOME)
    }
    ppack [ttk::label .td.tilde \
               -text [__ "'~' equals %s, e.g. %s" $ev $xpl]] \
        -in .td.bg -anchor w
  }

  # other widgets

  ppack [ttk::entry .td.e -width 60] -in .td.bg -fill x
  .td.e insert 0 [native_slashify $::vars($d)]

  pack [ttk::frame .td.f] -fill x -expand 1
  ttk::button .td.ok -text [__ "Ok"] -command {end_dlg [.td.e get] .td}
  ppack .td.ok -in .td.f -side right
  ttk::button .td.cancel -text [__ "Cancel"] -command {end_dlg "" .td}
  ppack .td.cancel -in .td.f -side right
  bind .td <Escape> {.td.cancel invoke}

  wm protocol .td WM_DELETE_WINDOW {.td.cancel invoke}
  wm resizable .td 1 0
  place_dlg .td .
  tkwait window .td
  if {$::dialog_ans ne ""} {set ::vars($d) $::dialog_ans}
}

proc toggle_port {} {
  set ::vars(instopt_portable) [expr {!$::vars(instopt_portable)}]
  set yn [yes_no $::vars(instopt_portable)]
  .dirportvl configure -text $yn
  commit_canonical_local
  if {$::vars(instopt_portable)} {
    set ::vars(TEXMFHOME) $::vars(TEXMFLOCAL)
    set ::vars(TEXMFVAR) $::vars(TEXMFSYSVAR)
    set ::vars(TEXMFCONFIG) $::vars(TEXMFSYSCONFIG)
    .tlocb state disabled
    .thomeb state disabled
    if {$::tcl_platform(platform) eq "windows"} {
      # adjust_path
      set ::vars(instopt_adjustpath) 0
      .pathb state disabled
      .pathl configure -foreground $::gry
      # desktop integration
      set ::vars(instopt_desktop_integration) 0
      .dkintb state disabled
      .dkintl configure -foreground $::gry
      # file associations
      set ::vars(instopt_file_assocs) 0
      .assocb state disabled
      .assocl configure -foreground $::gry
      # multi-user
      if $::is_admin {
        set ::vars(instopt_w32_multi_user) 0
        .adminb state disabled
        .adminl configure -foreground $::gry
      }
    } else {
      set ::vars(instopt_adjustpath) 0
      .symspec state disabled
      .pathb state disabled
      .pathl configure -foreground $::gry
    }
  } else {
    set ::vars(TEXMFHOME) "~/texmf"
    set ::vars(TEXMFVAR) "~/.texlive${::release_year}/texmf-var"
    set ::vars(TEXMFCONFIG) "~/.texlive${::release_year}/texmf-config"
    .tlocb state !disabled
    .thomeb state !disabled
    if {$::tcl_platform(platform) eq "windows"} {
      # adjust_path
      set ::vars(instopt_adjustpath) 1
      .pathb state !disabled
      .pathl configure -foreground $::blk
      # desktop integration
      set ::vars(instopt_desktop_integration) 1
      .dkintb state !disabled
      .dkintl configure -foreground $::blk
      # file associations
      set ::vars(instopt_file_assocs) 1
      .assocb state !disabled
      .assocl configure -foreground $::blk
      # multi-user
      if $::is_admin {
        set ::vars(instopt_w32_multi_user) 1
        .adminb state !disabled
        .adminl configure -foreground $::blk
      }
    } else {
      # set ::vars(instopt_adjustpath) 0
      # leave false, still depends on symlink paths
      .symspec state !disabled
      if [dis_enable_symlink_option] {
        .pathb state !disabled
        .pathl configure -foreground $::blk
      }
    }
  }
}; # toggle_port

#############################################################

##### selections: binaries, scheme, collections #####

proc show_stats {} {
  # n. of additional platforms
  if [winfo exists .binlm] {
    if {$::vars(n_systems_selected) < 2} {
      .binlm configure -text [__ "None"]
    } else {
      .binlm configure -text [expr {$::vars(n_systems_selected) - 1}]
    }
  }
  # n. out of n. packages
  if [winfo exists .lcolv] {
    .lcolv configure -text \
        [format "%d / %d" \
             $::vars(n_collections_selected) \
             $::vars(n_collections_available)]
  }
  if [winfo exists .schml] {
    .schml configure -text [__ $::scheme_descs($::vars(selected_scheme))]
  }
  # diskspace: can use -textvariable here
  # paper size
}; # show_stats

#############################################################

### binaries ###

# toggle platform in treeview widget, but not in underlying data
proc toggle_bin {b} {
  if {$b eq $::vars(this_platform)} {
    tk_messageBox -message [__ "Cannot deselect own platform"]
    return
  }
  set m [.tlbin.lst set $b "mk"]
  if {$m eq [mark_sym 0]} {
    .tlbin.lst set $b "mk" [mark_sym 1]
  } else {
    .tlbin.lst set $b "mk" [mark_sym 0]
  }
}; # toggle_bin

proc save_bin_selections {} {
  set ::vars(n_systems_selected) 0
  foreach b [.tlbin.lst children {}] {
    set bb "binary_$b"
    if {[.tlbin.lst set $b "mk"] ne [mark_sym 0]} {
      incr ::vars(n_systems_selected)
      set ::vars($bb) 1
    } else {
      set ::vars($bb) 0
    }
    if {$b eq "win32"} {
      set ::vars(collection-wintools) $::vars($bb)
    }
  }
  update_vars
  show_stats
}; # save_bin_selections

proc select_binaries {} {
  create_dlg .tlbin .
  wm title .tlbin [__ "Binaries"]

  # wallpaper
  pack [ttk::frame .tlbin.bg -padding 3] -expand 1 -fill both

  # ok, cancel buttons
  pack [ttk::frame .tlbin.buts] -in .tlbin.bg -side bottom -fill x
  ttk::button .tlbin.ok -text [__ "Ok"] -command \
      {save_bin_selections; update_vars; end_dlg 1 .tlbin}
  ppack .tlbin.ok -in .tlbin.buts -side right
  ttk::button .tlbin.cancel -text [__ "Cancel"] -command {end_dlg 0 .tlbin}
  ppack .tlbin.cancel -in .tlbin.buts -side right
  bind .tlbin <Escape> {.tlbin.cancel invoke}

  #set max_width 0
  #foreach b [array names ::bin_descs] {
  #  set bl [font measure TkTextFont [__ $::bin_descs($b)]]
  #  if {$bl > $max_width} {set max_width $bl}
  #}
  #incr max_width 10

  # treeview for binaries, with checkbox column and vertical scrollbar
  pack [ttk::frame .tlbin.binsf] -in .tlbin.bg -expand 1 -fill both

  ttk::treeview .tlbin.lst -columns {mk desc} -show {} \
      -selectmode extended -yscrollcommand {.tlbin.binsc set}

  ttk::scrollbar .tlbin.binsc -orient vertical -command {.tlbin.lst yview}
  .tlbin.lst column mk -stretch 0 -width [expr {$::cw * 3}]
  .tlbin.lst column desc -stretch 1
  foreach b [array names ::bin_descs] {
    set bb "binary_$b"
    .tlbin.lst insert {}  end -id $b -values \
        [list [mark_sym $::vars($bb)] [__ $::bin_descs($b)]]
  }
  pgrid .tlbin.lst -in .tlbin.binsf -row 0 -column 0 -sticky news
  pgrid .tlbin.binsc -in .tlbin.binsf -row 0 -column 1 -sticky ns
  grid columnconfigure .tlbin.binsf 0 -weight 1
  grid rowconfigure .tlbin.binsf 0 -weight 1
  bind .tlbin.lst <space> {toggle_bin [.tlbin.lst focus]}
  bind .tlbin.lst <Return> {toggle_bin [.tlbin.lst focus]}
  bind .tlbin.lst <ButtonRelease-1> \
      {toggle_bin [.tlbin.lst identify item %x %y]}

  wm protocol .tlbin WM_DELETE_WINDOW {.tlbin.cancel invoke}
  wm resizable .tlbin 1 1
  place_dlg .tlbin .
}; # select_binaries

#############################################################

### scheme ###

proc select_scheme {} {
  create_dlg .tlschm .
  wm title .tlschm [__ "Schemes"]

  # wallpaper
  pack [ttk::frame .tlschm.bg -padding 3] -fill both -expand 1

  # buttons at bottom
  pack [ttk::frame .tlschm.buts] -in .tlschm.bg -side bottom -fill x
  ttk::button .tlschm.ok -text [__ "Ok"] -command {
    # tree selection is a list:
    set ::vars(selected_scheme) [lindex [.tlschm.lst selection] 0]
    foreach v [array names ::vars] {
      if {[string range $v 0 6] eq "scheme-"} {
        if {$v eq $::vars(selected_scheme)} {
          set ::vars($v) 1
        } else {
          set ::vars($v) 0
        }
      }
    }
    update_vars
    show_stats
    end_dlg 1 .tlschm
  }
  ppack .tlschm.ok -in .tlschm.buts -side right
  ttk::button .tlschm.cancel -text [__ "Cancel"] -command {end_dlg 0 .tlschm}
  ppack .tlschm.cancel -in .tlschm.buts -side right
  bind .tlschm <Escape> {.tlschm.cancel invoke}

  # schemes list
  #set max_width 0
  #foreach s $::schemes_order {
  #  set sl [font measure TkTextFont [__ $::scheme_descs($s)]]
  #  if {$sl > $max_width} {set max_width $sl}
  #}
  #incr max_width 10
  ttk::treeview .tlschm.lst -columns {desc} -show {} -selectmode browse \
      -height [llength $::schemes_order]
  .tlschm.lst column "desc" -stretch 1; # -minwidth $max_width
  ppack .tlschm.lst -in .tlschm.bg -fill both -expand 1
  foreach s $::schemes_order {
    .tlschm.lst insert {} end -id $s -values [list [__ $::scheme_descs($s)]]
  }
  # we already made sure that $::vars(selected_scheme) has a valid value
  .tlschm.lst selection set [list $::vars(selected_scheme)]

  wm protocol .tlschm WM_DELETE_WINDOW {tlschm.cancel invoke}
  wm resizable .tlschm 1 0
  place_dlg .tlschm .
}; # select_scheme

#############################################################

### collections ###

# toggle collection in treeview widget, but not in underlying data
proc toggle_coll {cs c} {
  # cs: treeview widget; c: selected child item
  set m [$cs set $c "mk"]
  if {$m eq [mark_sym 0]} {
    $cs set $c "mk" [mark_sym 1]
  } else {
    $cs set $c "mk" [mark_sym 0]
  }
}; # toggle_coll

proc save_coll_selections {} {
  foreach wgt {.tlcoll.other .tlcoll.lang} {
    foreach c [$wgt children {}] {
      if {[$wgt set $c "mk"] eq [mark_sym 0]} {
        set ::vars($c) 0
      } else {
        set ::vars($c) 1
      }
    }
  }
  set ::vars(selected_scheme) "scheme-custom"
  update_vars
  show_stats
}; # save_coll_selections

proc select_collections {} {
  # 2018: more than 40 collections
  # The tcl installer acquires collections from install-menu-extl.pl,
  # but install-tl also has an array of collections.
  # Use treeview for checkbox column and display of
  # collection descriptions rather than names.
  # buttons: select all, select none, ok, cancel
  # should some collections be excluded? Check install-menu-* code.
  create_dlg .tlcoll .
  wm title .tlcoll [__ "Collections"]

  # wallpaper
  pack [ttk::frame .tlcoll.bg -padding 3] -fill both -expand 1

  # frame at bottom with ok and cancel buttons
  pack [ttk::frame .tlcoll.butf] -in .tlcoll.bg -side bottom -fill x
  ttk::button .tlcoll.ok -text [__ "Ok"] -command \
      {save_coll_selections; end_dlg 1 .tlcoll}
  ppack .tlcoll.ok -in .tlcoll.butf -side right
  ttk::button .tlcoll.cancel -text [__ "Cancel"] -command {end_dlg 0 .tlcoll}
  ppack .tlcoll.cancel -in .tlcoll.butf -side right
  bind .tlcoll <Escape> {.tlcoll.cancel invoke}

  # Treeview and scrollbar for non-language- and language collections resp.
  pack [ttk::frame .tlcoll.both] -in .tlcoll.bg -expand 1 -fill both

  foreach t {"lang" "other"} {

    # frames with select all/none buttons, separately for lang and others
    set wgb .tlcoll.b$t
    ttk::frame $wgb
    ttk::label ${wgb}sel -text [__ "Select"]
    ttk::button ${wgb}all -text [__ "All"] -padding 1 -command \
      "foreach c \[.tlcoll.$t children {}\] \{
        .tlcoll.$t set \$c mk \[mark_sym 1\]\}"
    ttk::button ${wgb}none -text [__ "None"] -padding 1 -command \
      "foreach c \[.tlcoll.$t children {}\] \{
        .tlcoll.$t set \$c mk \[mark_sym 0\]\}"
    pack ${wgb}sel ${wgb}all ${wgb}none -in $wgb \
        -side left -padx 3 -pady 3

    # trees with collections and markers, lang and other separately
    set wgt ".tlcoll.$t"
    ttk::treeview $wgt -columns {mk desc} -show {headings} \
        -selectmode extended -yscrollcommand "${wgt}sc set"
    $wgt heading "mk" -text ""
    if {$t eq "lang"} {
      $wgt heading "desc" -text [__ "Languages"]
    } else {
      $wgt heading "desc" -text [__ "Other collections"]
    }
    # and their vertical scrollbars
    ttk::scrollbar ${wgt}sc -orient vertical -command "$wgt yview"
    $wgt column mk -width [expr {$::cw * 3}] -stretch 0
    $wgt column desc -stretch 1

    bind $wgt <space> {toggle_coll %W [%W focus]}
    bind $wgt <Return> {toggle_coll %W [%W focus]}
    bind $wgt <ButtonRelease-1> {toggle_coll %W [%W identify item %x %y]}
  }
  grid .tlcoll.blang x .tlcoll.bother -in .tlcoll.both -sticky w
  grid .tlcoll.lang .tlcoll.langsc .tlcoll.other .tlcoll.othersc \
      -in .tlcoll.both
  grid columnconfigure .tlcoll.both 0 -weight 1
  grid columnconfigure .tlcoll.both 1 -weight 0
  grid columnconfigure .tlcoll.both 2 -weight 2
  grid columnconfigure .tlcoll.both 3 -weight 0
  grid configure .tlcoll.lang .tlcoll.other .tlcoll.langsc .tlcoll.othersc \
      -sticky nsew
  grid rowconfigure .tlcoll.both 1 -weight 1


  foreach c [array names ::coll_descs] {
    if [string equal -length 15 "collection-lang" $c] {
      set wgt ".tlcoll.lang"
    } else {
      set wgt ".tlcoll.other"
    }
    $wgt insert {} end -id $c -values \
        [list [mark_sym $::vars($c)] [__ $::coll_descs($c)]]
  }

  wm protocol .tlcoll WM_DELETE_WINDOW {.tlcoll.cancel invoke}
  wm resizable .tlcoll 1 1
  place_dlg .tlcoll .
}; # select_collections

##################################################

# option handling

# for multi-value options:
# below, $c is a combobox with values $l. The index of the current value in $l
# corresponds to the value of $::vars($v).

proc var2combo {v c} {
  $c current $::vars($v)
}
proc combo2var {c v} {
  set ::vars($v) [$c current]
}
# if the variable has an impact on what to install:
proc combo2var_calc {c v} {
  combo2var c v
  update_vars
  show_stats
}

##### desktop integration; platform-specific #####

if {$::tcl_platform(platform) ne "windows"} {

  ### symlinks into standard directories ###

  # 'file writable' is only a check of unix permissions
  proc dest_ok {d} {
    if {$d eq ""} {return 0}
    if {! [file isdirectory $d]} {return 0}
    if {! [file writable $d]} {return 0}
    return 1
  }

  proc dis_enable_symlink_option {} {
    set ok 1
    foreach v {"bin" "man" "info"} {
      set vv "tlpdbopt_sys_$v"
      if {! [info exists ::vars($vv)]} {set ok 0; break}
      set d $::vars($vv)
      if {![dest_ok $d]} {set ok 0; break}
    }
    if {$ok && !$::vars(instopt_portable)} {
      .pathb state !disabled
      .pathl configure -foreground $::blk
    } else {
      set ok 0
      .pathb state disabled
      .pathl configure -foreground $::gry
      set ::vars(instopt_adjustpath) 0
    }
    return $ok
  }

  # check validity of all three proposed symlink target directories.
  # do not dis/enable .pathb until return from .edsyms dialog.
  proc check_sym_entries {} {
    set ok 1
    foreach v {"bin" "man" "info"} {
      if [dest_ok [.edsyms.${v}e get]] {
        .edsyms.${v}mk configure -text "\u2714" -foreground $::blk
      } else {
        .edsyms.${v}mk configure -text "\u2718" -foreground red
        set ok 0
      }
    }
    if $ok {
      .edsyms.warn configure -text ""
    } else {
      .edsyms.warn configure -text \
          [__ "Warning. Not all configured directories are writable!"]
    }
  }

  proc commit_sym_entries {} {
    foreach v {"bin" "man" "info"} {
      set vv "tlpdbopt_sys_$v"
      set ::vars($vv) [.edsyms.${v}e get]
      if {[string index $::vars($vv) 0] eq "~"} {
        set ::vars($vv) "$::env(HOME)[string range $::vars($vv) 1 end]"
      }
    }
    if [dis_enable_symlink_option] {
      set ::vars(instopt_adjustpath) 1
    }
  }

  proc edit_symlinks {} {

    create_dlg .edsyms .
    wm title .edsyms [__ "Symlinks"]

    pack [ttk::frame .edsyms.bg -padding 3] -expand 1 -fill both
    set rw -1

    pack [ttk::frame .edsyms.fr0] -in .edsyms.bg -expand 1 -fill both
    foreach v {"bin" "man" "info"} {
      incr rw
      # description
      pgrid [ttk::label .edsyms.${v}l -text ""] \
          -in .edsyms.fr0 -row $rw -column 0 -sticky e
      # ok mark
      pgrid [ttk::label .edsyms.${v}mk -text ""] \
          -in .edsyms.fr0 -row $rw -column 1
      # entry widget
      pgrid [ttk::entry .edsyms.${v}e -width 40] \
          -in .edsyms.fr0 -row $rw -column 2
      set vv "tlpdbopt_sys_$v"
      if [info exists ::vars($vv)] {
        .edsyms.${v}e insert 0 $::vars($vv)
      }; # else leave empty
      bind .edsyms.${v}e <KeyRelease> {+check_sym_entries}
      # browse button
      pgrid [ttk::button .edsyms.${v}br -text [__ "Browse..."] -command \
                 "dirbrowser2widget .edsyms.${v}e; check_sym_entries"] \
         -in .edsyms.fr0 -row $rw -column 3
    }
    .edsyms.binl configure -text [__ "Binaries"]
    .edsyms.manl configure -text [__ "Man pages"]
    .edsyms.infol configure -text [__ "Info pages"]

    # warning about read-only target directories
    incr rw
    pgrid [ttk::label .edsyms.warn -foreground red] \
        -in .edsyms.fr0 -column 2 -columnspan 2 -sticky w

    grid columnconfigure .edsyms.fr0 0 -weight 0
    grid columnconfigure .edsyms.fr0 1 -weight 0
    grid columnconfigure .edsyms.fr0 2 -weight 1
    grid columnconfigure .edsyms.fr0 3 -weight 0

    # ok, cancel
    pack [ttk::frame .edsyms.fr1] -expand 1 -fill both
    ppack [ttk::button .edsyms.ok -text [__ "Ok"] -command {
      commit_sym_entries; end_dlg 1 .edsyms}] -in .edsyms.fr1 -side right
    ppack [ttk::button .edsyms.cancel -text [__ "Cancel"] -command {
      end_dlg 0 .edsyms}] -in .edsyms.fr1 -side right
    bind .edsyms <Escape> {.edsyms.cancel invoke}

    check_sym_entries

    wm protocol .edsyms  WM_DELETE_WINDOW {.edsyms.cancel invoke}
    wm resizable .edsyms 1 0
    place_dlg .edsyms .
  }
}

#############################################################

# the main menu interface will at certain events send the current values of
# the ::vars array to install-tl[-tcl], which will send back an updated version
# of this array.
# We still use blocking i/o: frontend and backend wait for each other.

# idea: follow submenu organization of text installer
# for 3-way options, create an extra level of children
# instead of wizard install, supppress some options

proc run_menu {} {
  if [info exists ::env(dbgui)] {
    puts "dbgui: run_menu: advanced is now $::advanced"
  }
  wm withdraw .
  foreach c [winfo children .] {
    destroy $c
  }

  # wallpaper
  pack [ttk::frame .bg -padding 3] -fill both -expand 1

  # title
  ttk::label .title -text [__ "TeX Live %s Installer" $::release_year] \
      -font titlefont
  pack .title -pady 10 -in .bg

  pack [ttk::separator .seph0 -orient horizontal] \
      -in .bg -pady 3 -fill x

  # frame at bottom with install/quit buttons
  pack [ttk::frame .final] \
      -in .bg -side bottom -pady [list 5 2] -fill x
  ppack [ttk::button .install -text [__ "Install"] -command {
    set ::menu_ans "startinst"}] -in .final -side right
  ppack [ttk::button .quit -text [__ "Quit"] -command {
    set ::out_log {}
    set ::menu_ans "no_inst"}] -in .final -side right
  bind . <Escape> whataboutclose
  if {!$::advanced} {
    ppack [ttk::button .adv -text [__ "Advanced"] -command {
      set ::menu_ans "advanced"
      if [info exists ::env(dbgui)] {puts "dbgui: requested advanced"}
    }] -in .final -side left
  }
  pack [ttk::separator .seph1 -orient horizontal] \
      -in .bg -side bottom -pady 3 -fill x

  # directories, selections
  if $::advanced {
    pack [ttk::frame .left] -in .bg -side left -fill both -expand 1
    set curf .left
  } else {
    pack [ttk::frame .main] -in .bg -side top -fill both -expand 1
    set curf .main
  }

  # labelframes do not look quite right on macos

  # directory section
  pack [ttk::frame .dirf] -in $curf -fill x
  grid columnconfigure .dirf 1 -weight 1
  set rw -1

  if $::advanced {
    incr rw
    pgrid [ttk::label .dirftitle -text [__ "Installation root"] \
               -font hfont] \
        -in .dirf -row $rw -column 0 -columnspan 3 -sticky w
    .dirftitle configure -text [__ "Directories"]
  }

  incr rw
  pgrid [ttk::label .tdirll] -in .dirf -row $rw -column 0 -sticky nw
  set s [__ "Installation root"]
  if $::advanced {
    .tdirll configure -text "TEXDIR:\n$s"
  } else {
    .tdirll configure -text $s
  }
  pgrid [ttk::label .tdirvl -textvariable ::vars(TEXDIR)] \
      -in .dirf -row $rw -column 1 -sticky nw
  pgrid [ttk::button .tdirb -text [__ "Change"] -command texdir_setup] \
    -in .dirf -row $rw -column 2 -sticky new

  if $::advanced {
    incr rw
    set s [__ "Local additions"]
    pgrid [ttk::label .tlocll -text "TEXMFLOCAL:\n$s"] \
        -in .dirf -row $rw -column 0 -sticky nw
    pgrid [ttk::label .tlocvl -textvariable ::vars(TEXMFLOCAL)] \
        -in .dirf -row $rw -column 1 -sticky nw
    ttk::button .tlocb -text [__ "Change"] -command {edit_dir "TEXMFLOCAL"}
    pgrid .tlocb -in .dirf -row $rw -column 2 -sticky new

    incr rw
    set s [__ "Per-user additions"]
    pgrid [ttk::label .thomell -text "TEXMFHOME:\n$s"] \
        -in .dirf -row $rw -column 0 -sticky nw
    pgrid [ttk::label .thomevl -textvariable ::vars(TEXMFHOME)] \
        -in .dirf -row $rw -column 1 -sticky nw
    ttk::button .thomeb -text [__ "Change"] -command {edit_dir "TEXMFHOME"}
    pgrid .thomeb -in .dirf -row $rw -column 2 -sticky ne

    incr rw
    pgrid [ttk::label .dirportll \
        -text [__ "Portable setup:\nMay reset TEXMFLOCAL\nand TEXMFHOME"]] \
        -in .dirf -row $rw -column 0 -sticky nw
    pgrid [ttk::label .dirportvl] -in .dirf -row $rw -column 1 -sticky nw
    pgrid [ttk::button .tportb -text [__ "Toggle"] -command toggle_port] \
      -in .dirf -row $rw -column 2 -sticky ne
    .dirportvl configure -text [yes_no $::vars(instopt_portable)]

    # platforms section
    if {$::tcl_platform(platform) ne "windows"} {
      pack [ttk::frame .platf] -in .left -fill x
      grid columnconfigure .platf 1 -weight 1
      set rw -1

      incr rw
      pgrid [ttk::label .binftitle -text [__ "Platforms"] -font hfont] \
        -in .platf -row $rw -column 0 -columnspan 3 -sticky w

      # current platform
      incr rw
      ttk::label .binl0 \
          -text "Current platform:"
      pgrid .binl0 -in .platf -row $rw -column 0 -sticky w
      ttk::label .binl1 \
          -text [__ "$::bin_descs($::vars(this_platform))"]
      pgrid .binl1 -in .platf -row $rw -column 1 -sticky w
      # additional platforms
      incr rw
      pgrid [ttk::label .binll -text [__ "N. of additional platform(s):"]] \
          -in .platf -row $rw -column 0 -sticky w
      pgrid [ttk::label .binlm] -in .platf -row $rw -column 1 -sticky w
      pgrid [ttk::button .binb -text [__ "Change"] -command select_binaries] \
          -in .platf -row $rw -column 2 -sticky e
    }

    # Selections section
    pack [ttk::frame .selsf] -in .left -fill x
    grid columnconfigure .selsf 1 -weight 1
    set rw -1

    incr rw
    pgrid [ttk::label .selftitle -text [__ "Selections"] -font hfont] \
        -in .selsf -row $rw -column 0 -columnspan 3 -sticky w

    # schemes
    incr rw
    pgrid [ttk::label .schmll -text [__ "Scheme:"]] \
        -in .selsf -row $rw -column 0 -sticky w
    pgrid [ttk::label .schml -text ""] \
        -in .selsf -row $rw -column 1 -sticky w
    pgrid [ttk::button .schmb -text [__ "Change"] -command select_scheme] \
        -in .selsf -row $rw -column 2 -sticky e

    # collections
    incr rw
    pgrid [ttk::label .lcoll -text [__ "N. of collections:"]] \
        -in .selsf -row $rw -column 0 -sticky w
    pgrid [ttk::label .lcolv] -in .selsf -row $rw -column 1 -sticky w
    pgrid [ttk::button .collb -text [__ "Customize"] \
               -command select_collections] \
        -in .selsf -row $rw -column 2 -sticky e
  }

  # total size
  # curf: current frame
  set curf [expr {$::advanced ? ".selsf" : ".dirf"}]
  incr rw
  ttk::label .lsize -text [__ "Disk space required (in MB):"]
  ttk::label .size_req -textvariable ::vars(total_size)
  pgrid .lsize -in $curf -row $rw -column 0 -sticky e
  pgrid .size_req -in $curf -row $rw -column 1 -sticky w

  ########################################################
  # right side: options
  # 3 columns. Column 1 can be merged with either 0 or 2.

  if $::advanced {

    pack [ttk::separator .sepv -orient vertical] \
        -in .bg -side left -padx 3 -fill y
    pack [ttk::frame .options] -in .bg -side right -fill both -expand 1

    set curf .options
    grid columnconfigure .options 0 -weight 1
    set rw -1

    incr rw
    pgrid [ttk::label .optitle -text [__ "Options"] -font hfont] \
        -in $curf -row $rw -column 0 -columnspan 3 -sticky w
  } else {
    set curf .dirf
  }

  # instopt_letter
  set ::lpapers [list "A4" "letter"]
  incr rw
  pgrid [ttk::label .paperl -text [__ "Default paper size"]] \
      -in $curf -row $rw -column 0 -sticky w
  pgrid [ttk::combobox .paperb -values $::lpapers -state readonly -width 8] \
      -in $curf -row $rw -column 1 -columnspan 2 -sticky e
  var2combo "instopt_letter" .paperb
  bind .paperb <<ComboboxSelected>> {+combo2var .paperb "instopt_letter"}

  if $::advanced {
    # instopt_write18_restricted
    incr rw
    pgrid [ttk::label .write18l -text \
        [__ "Allow execution of restricted list of programs via \\write18"]] \
        -in $curf -row $rw -column 0 -columnspan 2 -sticky w
    ttk::checkbutton .write18b -variable ::vars(instopt_write18_restricted)
    pgrid .write18b -in $curf -row $rw -column 2 -sticky e

    # tlpdbopt_create_formats
    incr rw
    pgrid [ttk::label .formatsl -text [__ "Create all format files"]] \
        -in $curf -row $rw -column 0 -columnspan 2 -sticky w
    ttk::checkbutton .formatsb -variable ::vars(tlpdbopt_create_formats)
    pgrid .formatsb -in $curf -row $rw -column 2 -sticky e

    # tlpdbopt_install_docfiles
    if $::vars(doc_splitting_supported) {
      incr rw
      pgrid [ttk::label .docl -text [__ "Install font/macro doc tree"]] \
          -in $curf -row $rw -column 0 -columnspan 2 -sticky w
      ttk::checkbutton .docb -variable ::vars(tlpdbopt_install_docfiles) \
          -command {update_vars; show_stats}
      pgrid .docb -in $curf -row $rw -column 2 -sticky e
    }

    # tlpdbopt_install_srcfiles
    if $::vars(src_splitting_supported) {
      incr rw
      pgrid [ttk::label .srcl -text [__ "Install font/macro source tree"]] \
          -in $curf -row $rw -column 0 -columnspan 2 -sticky w
      ttk::checkbutton .srcb -variable ::vars(tlpdbopt_install_srcfiles) \
          -command {update_vars; show_stats}
      pgrid .srcb -in $curf -row $rw -column 2 -sticky e
    }
  }

  if {$::tcl_platform(platform) eq "windows"} {

    if $::advanced {
      # instopt_adjustpath
      incr rw
      pgrid [ttk::label .pathl -text [__ "Adjust searchpath"]] \
          -in $curf -row $rw -column 0 -columnspan 2 -sticky w
      ttk::checkbutton .pathb -variable ::vars(instopt_adjustpath)
      pgrid .pathb -in $curf -row $rw -column 2 -sticky e

      # tlpdbopt_desktop_integration
      set ::desk_int \
          [list [__ "No shortcuts"] [__ "TeX Live menu"] [__ "Launcher entry"]]
      incr rw
      pgrid [ttk::label .dkintl -text [__ "Desktop integration"]] \
          -in $curf -row $rw -column 0 -sticky w
      pgrid [ttk::combobox .dkintb -values $::desk_int -state readonly \
                 -width 20] \
          -in $curf -row $rw -column 1 -columnspan 2 -sticky e
      var2combo "tlpdbopt_desktop_integration" .dkintb
      bind .dkintb <<ComboboxSelected>> \
          {+combo2var .dkintb "tlpdbopt_desktop_integration"}

      # tlpdbopt_file_assocs
      set ::assoc [list [__ "None"] [__ "Only new"] [__ "All"]]
      incr rw
      pgrid [ttk::label .assocl -text [__ "File associations"]] \
          -in $curf -row $rw -column 0 -sticky w
      pgrid [ttk::combobox .assocb -values $::assoc -state readonly -width 12] \
          -in $curf -row $rw -column 1 -columnspan 2 -sticky e
      var2combo "tlpdbopt_file_assocs" .assocb
      bind .assocb <<ComboboxSelected>> \
          {+combo2var .assocb "tlpdbopt_file_assocs"}
    }

    # tlpdbopt_w32_multi_user
    incr rw
    pgrid [ttk::label .adminl -text [__ "Install for all users"]] \
        -in $curf -row $rw -column 0 -columnspan 2 -sticky w
    ttk::checkbutton .adminb -variable ::vars(tlpdbopt_w32_multi_user)
    pgrid .adminb -in $curf -row $rw -column 2 -sticky e
    if {!$::is_admin} {
      .adminb state disabled
      .adminl configure -foreground $::gry
    }

    # collection-texworks
    incr rw
    pgrid [ttk::label .texwl -text [__ "Install TeXworks front end"]] \
        -in $curf -row $rw -column 0 -columnspan 2 -sticky w
    ttk::checkbutton .texwb -variable ::vars(collection-texworks)
    pgrid .texwb -in $curf -row $rw -column 2 -sticky e
    bind .texwb <ButtonRelease> {+
      set ::vars(selected_scheme) "scheme-custom"; update_vars; show_stats}
    bind .texwb <Return> {+
      set ::vars(selected_scheme) "scheme-custom"; update_vars; show_stats}
    bind .texwb <space> {+
      set ::vars(selected_scheme) "scheme-custom"; update_vars; show_stats}

  } else {
    if $::advanced {
      # instopt_adjustpath, unix edition: symlinks
      # tlpdbopt_sys_[bin|info|man]
      incr rw
      pgrid [ttk::label .pathl \
                 -text [__ "Create symlinks in system directories"]] \
          -in $curf -row $rw -column 0 -columnspan 2 -sticky w
      pgrid [ttk::checkbutton .pathb -variable ::vars(instopt_adjustpath)] \
          -in $curf -row $rw -column 2 -sticky e
      dis_enable_symlink_option; # enable only if standard directories ok
      incr rw
      pgrid [ttk::button .symspec -text [__ "Specify directories"] \
                 -command edit_symlinks] \
          -in $curf -row $rw -column 1 -columnspan 2 -sticky e
    }
  }

  if $::advanced {
    # spacer/filler
    incr rw
    pgrid [ttk::label .spaces -text " "] -in $curf -row $rw -column 0
    grid rowconfigure $curf $rw -weight 1
    # final entry: instopt_adjustrepo
    incr rw
    pgrid [ttk::label .ctanl -text \
               [__ "After install, set CTAN as source for package updates"]] \
        -in $curf -row $rw -column 0 -columnspan 2 -sticky w
    pgrid [ttk::checkbutton .ctanb -variable ::vars(instopt_adjustrepo)] \
      -in $curf -row $rw -column 2 -sticky e
  }

  show_stats
  wm overrideredirect . 0
  wm attributes . -topmost
  wm resizable . 0 0
  update
  wm state . normal
  raise .
  unset -nocomplain ::menu_ans
  vwait ::menu_ans
  return $::menu_ans
}; # run_menu

#############################################################

# we need data from the backend.
# choices of schemes, platforms and options impact choices of
# collections and required disk space.
# the vars array contains all this variable information.
# the calc_depends proc communicates with the backend to update this array.

proc read_descs {} {
  set l [read_line_no_eof]
  if {$l ne "descs"} {
    err_exit "'descs' expected but $l found"
  }
  while 1 {
    set l [read_line_no_eof]
    if [regexp {^([^:]+): (\S+) (.*)$} $l m p c d] {
      if {$c eq "Collection"} {
        set ::coll_descs($p) $d
      } elseif {$c eq "Scheme"} {
        set ::scheme_descs($p) $d
      }
    } elseif {$l eq "enddescs"} {
      break
    } else {
      err_exit "Illegal line $l in descs section"
    }
  }
  set ::scheme_descs(scheme-custom) [__ "Custom scheme"]
}

proc read_vars {} {
  set l [read_line_no_eof]
  if {$l ne "vars"} {
    err_exit "'vars' expected but $l found"
  }
  while 1 {
    set l [read_line_no_eof]
    if [regexp {^([^:]+): (.*)$} $l m k v] {
      set ::vars($k) $v
    } elseif {$l eq "endvars"} {
      break
    } else {
      err_exit "Illegal line $l in vars section"
    }
  }
  if {"total_size" ni [array names ::vars]} {
    set ::vars(total_size) 0
  }
}; # read_vars

proc write_vars {} {
  chan puts $::inst "vars"
  foreach v [array names ::vars] {chan puts $::inst "$v: $::vars($v)"}
  chan puts $::inst "endvars"
  chan flush $::inst
}

proc update_vars {} {
  chan puts $::inst "calc"
  write_vars
  read_vars
}

proc read_menu_data {} {
  # the expected order is: year, descs, vars, schemes (one line), binaries
  # note. lindex returns an empty string if the index argument is too high.
  # empty lines result in an err_exit.

  # year; should be first line
  set l [read_line_no_eof]
  if [regexp {^year: (\S+)$} $l d y] {
    set ::release_year $y
  } else {
    err_exit "year expected but $l found"
  }

  # windows: admin status
  if {$::tcl_platform(platform) eq "windows"} {
    set l [read_line_no_eof]
    if [regexp {^admin: ([01])$} $l d a] {
      set ::is_admin $a
    } else {
      err_exit "admin: \[0|1\] expected but $l found"
    }
  }

  read_descs

  read_vars

  # schemes order (one line)
  set l [read_line_no_eof]
  if [regexp {^schemes_order: (.*)$} $l m sl] {
    set ::schemes_order $sl
  } else {
    err_exit "schemes_order expected but $l found"
  }
  if {"selected_scheme" ni [array names ::vars] || \
        $::vars(selected_scheme) ni $::schemes_order} {
    set ::vars(selected_scheme) [lindex $::schemes_order 0]
  }

  # binaries
  set l [read_line_no_eof]
  if {$l ne "binaries"} {
    err_exit "'binaries' expected but $l found"
  }
  while 1 {
    set l [read_line_no_eof]
    if [regexp {^([^:]+): (.*)$} $l m k v] {
      set ::bin_descs($k) $v
    } elseif {$l eq "endbinaries"} {
      break
    } else {
      err_exit "Illegal line $l in binaries section"
    }
  }

  set l [read_line_no_eof]
  if {$l ne "endmenudata"} {
    err_exit "'endmenudata' expected but $l found"
  }
}; # read_menu_data

proc answer_to_perl {} {
  # we just got a line "mess_yesno" from perl
  # finish reading the message text, put it in a message box
  # and write back the answer
  set mess {}
  while 1 {
    set ll [read_line]
    if {[lindex $ll 0] < 0} {
      err_exit "Error while reading from Perl backend"
    } else {
      set l [lindex $ll 1]
    }
    if  {$l eq "endmess"} {
      break
    } else {
      lappend mess $l
    }
  }
  set m [join $mess "\n"]
  set ans [tk_messageBox -type yesno -icon question -message $m]
  chan puts $::inst [expr {$ans eq yes ? "y" : "n"}]
  chan flush $::inst
}; # answer_to_perl

proc run_installer {} {
  set ::out_log {}
  show_log 1; # 1: with abort button
  .close state disabled
  if $::did_gui {
    chan puts $::inst "startinst"
    write_vars
  }
  # the backend was already running and needs no further encouragement

  # switch to non-blocking i/o
  chan configure $::inst -buffering line -blocking 0
  chan event $::inst readable read_line_cb
}; # run_installer

proc whataboutclose {} {
  if [winfo exists .abort] {
    # log window with abort
    .abort invoke
  } elseif [winfo exists .log] {
    # log window without abort
    .close invoke
  } elseif [winfo exists .quit] {
    # menu window
    .quit invoke
  }
  # no action for close button of splash screen
}

proc main_prog {} {

  wm title . [__ "TeX Live Installer"]
  wm protocol . WM_DELETE_WINDOW whataboutclose

  make_splash

  # start install-tl-[tcl] via a pipe.
  # the command must be a string, not a list.
  # therefore, arguments with spaces must be quoted.
  # although we build the command at first as a list,
  # it will be joined into a string at a second step
  set cmd [list ${::perlbin} "${::instroot}/install-tl" \
               "-from_ext_gui" {*}$::argv]
  set i 0
  while {$i<[llength $cmd]} {
    set c [lindex $cmd $i]
    if {[string first " " $c] >= 0} {
      lset cmd $i "\"$c\""
    }
    incr i
  }
  unset i
  show_time "opening pipe"
  if [catch {open "|[join $cmd " "] 2>@1" r+} ::inst] {
    # "2>@1" ok under Windows >= XP
    err_exit "Error starting Perl backend"
  }
  show_time "opened pipe"
  set ::perlpid [pid $::inst]

  # for windows < 10: make sure the main window is still on top
  wm attributes . -topmost

  # do not start event-driven, non-blocking io
  # until the actual installation starts
  chan configure $::inst -buffering line -blocking 1

  # possible input from perl until the menu starts:
  # - question about prior canceled installation
  # - menu data, help, version, print-platform
  set ::did_gui 0
  set answer ""
  while 1 {
    set ll [read_line]
    if {[lindex $ll 0] < 0} break
    set l [lindex $ll 1]
    # There may be occasion for a dialog
    if {$l eq "mess_yesno"} {
      answer_to_perl
    } elseif {$l eq "menudata"} {
      # we do want a menu, so we expect menu data,
      # which may take a while
      read_menu_data
      show_time "read menu data from perl"
      set ::advanced 0
      set answer [run_menu]
      if {$answer eq "advanced"} {
        # this could only happen if $::advanced was 0
        set ::advanced 1
        if [info exists ::env(dbgui)] {puts "dbgui: Setting advanced to 1"}
        set answer [run_menu]
      }
      set ::did_gui 1
      break
    } elseif {$l eq "startinst"} {
      # use an existing profile:
      set ::out_log {}
      set answer "startinst"
      break
    } else {
      lappend ::out_log $l
    }
  }
  if {$answer eq "startinst"} {
    run_installer
    # invokes show_log which first destroys previous children
  } else {
    log_exit
  }
}; # main_prog

#file delete $::dblfile

main_prog